I'm messing with every file I can find at the moment. Some are in MyDocs under SH4, the rest are in wherever you installed the rest of SH4 under Data. Some are in Cfg and Main, but a lot of what I'm playing with is in UPCdata.
BE CAREFUL. I'm trying to figure out what I altered that has my guys dying inexplicably. They have 99,999hp but some are dead. I also can't get them to sleep enough, and that goes the same even WITHOUT modding the game. That's the first thing that got me interested in changing their values because they were dying while standing watch! No matter how much I swap them around, spend days doing nothing at sea, etc, their Efficiency goes to 0 and they end up dying even when we've taken no damage.
In the current state of mod, I've got 6 dead guys. But they all died DAYS after any combat. Those who are wounded, even though their health might be 99 or 96, STILL won't rest or sleep!
Right now I'm curious if the Maintenance schedule is a factored requirement in the game. If its not, I want to zero it out and add that value to the SleepCoef. With all the stuff I've tweaked around this afternoon, who knows what needs fixing. LOL But it's not terribly worse than it was as-delivered. No matter what I do, I can get to Japan, do my mission, and get partway back before everyone commits suicide.
And I just LOST my save file after a 3 hour patrol when I tried editing the dead guys back to life. Went in to see if it changed anything, but they were still listed with 0 health as dead guys. Saved over it again and exited, but when I checked the MyDocs folders it was GONE. So be careful while you tweak.
I know some die-hards would cry fowl at this, but for my interest in gameplay I could do without the wacky crew situation. I want them to be alert, not dead, and its really annoying me. At least in SH3 there were empty BUNKS to rotate guys to. In this one everyone stays where they are and on their feet for a week until they drop dead. Even rotating the guys who are worse off so they get more shifts sleeping doesn't work because they WON'T SLEEP.
RPG-like enough for you yet?